This browsing ant was found feasting on the yeast and sugar available in the broken beer bottles. These are able to form super colonies with multiple queens and due to their scavenging nature these can pose a serious threat to the food chain of the native animals besides damaging the insect world. Beer bait has been used to lure these ants who pick up the bait and feed to the queens. It works as birth regulator as the queens become sterile and stop laying eggs. Thus, the colony ends up like the zombie.
More info: dailytelegraph